よこばいガラガラへびであれば
横這いガラガラ蛇であれば
yokobai garagara hebideareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of よこばいガラガラへび

1. If it were a sidewinder rattlesnake.; If it is a sidewinder rattlesnake.

Ba Conditional
Usually Written in Kana